Downhole micro-seismic event real-time inversion location method based on grid search

A technology of grid search and positioning method, which is applied in the fields of seismology, seismic signal processing, and instruments for well logging records, and can solve problems such as low signal-to-noise ratio and first-arrival time error

Active Publication Date: 2016-11-23
中石化石油工程地球物理有限公司胜利分公司
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Problems solved by technology

[0005] At present, most of the commonly used seismic source location algorithms need to use the arrival time information of P-wave and S-wave of microseismic events. Due to the low signal-to-noise ratio of some microseismic events, there is usually a large error in the picked-up first-arrival time. Therefore, It is very necessary to study a seismic source location method with strong noise resistance

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  • Downhole micro-seismic event real-time inversion location method based on grid search
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  • Downhole micro-seismic event real-time inversion location method based on grid search

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[0037] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0038] like figure 1 as shown, figure 1 It is a flow chart of the grid search-based real-time inversion positioning method for downhole microseismic events of the present invention.

[0039] refer to figure 1 , in step 110, a velocity model is established in the space below the wellhead containing microseismic sources. Here velocity models can be modeled in the space below the wellhead containing microseismic sources. Steps may include: modeling initial velocities in the space below the wellhead containing microseismic sources based on sonic logging and other velocity data; The time difference and the known receiving and firing position information are inverted on the basis of the initial velocity model to obtain an accurate velocity model. The ve...

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Abstract

The present invention provides a downhole micro-seismic event real-time inversion location method based on grid search. The method comprises: establishing a speed model in a space including a micro-seismic source under the well; performing P-wave and S-wave first arrival time pickup of the micro-seismic event; calculating the degree of polarization and the polarization direction of each channel recorded P-wave first arrival of the micro-seismic event; establishing a inversion target function, and performing the theory first arrival travel time from wave field forward modeling calculation grid points to an observation system; calculating a target function value, and determining the position of the seismic source; and calculating the three-dimensional spatial position coordinates of the seismic source. The method is fast in operation speed and high in efficiency; and moreover, the noise immunity is high, the micro-seismic event with low signal to noise ratio can be subjected to accurate micro-seismic source location to allow the micro-seismic source location result to be more accurate and reliable so as to improve the interpreting precision of the micro-seismic monitoring result.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a grid search-based real-time inversion positioning method for downhole microseismic events. Background technique [0002] Hydraulic fracturing is one of the main means used to increase production and injection in the production and development of oil and gas fields. Since the 1970s, large-scale hydraulic fracturing has been widely used in low-permeability and ultra-low-permeability oil and gas reservoirs. Studying the development process of fractures, predicting the effect of hydraulic fracturing, and determining the best plan have important guiding significance for fracturing construction. The earliest research on fracturing process simulation can be traced back to the 1960s. At that time, the research was limited to completely ignoring the formula of rock mechanics analysis and some simple two-dimensional models developed later, but these models did not conform t...

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Application Information

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IPC IPC(8): G01V1/50G06F19/00
Inventor 冯刚何川胡来东段卫星于静陆振贤薛亚琴潘元华
Owner 中石化石油工程地球物理有限公司胜利分公司
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